组播编程

来源：互联网发布：linux把用户从组中删除编辑：程序博客网时间：2024/06/04 19:25

组播编程（含一个端口加入多个组播）

1**. 组播客户端**

.h文件

#pragma  once#include <stdio.h>#include <stdlib.h>#include <string.h>//#include <ZYF_SRC/osal/OSAL.cpp>#ifdef WIN32    #include <winsock.h>//ip_mreq    //#include <WINSOCK2.H>    #pragma comment(lib, "Wsock32.lib")//ws2_32.lib    #define close closesocket    #define LOCAL_IP "192.168.0.235"//修改自己的ip    typedef int socklen_t;#else    #include <sys/types.h>    #include <sys/socket.h>    #include <arpa/inet.h>    #include <netinet/in.h>    #include <unistd.h>//close()#endif#define  GROUP_IP1  "239.255.0.2"//224.0.0.0-239.255.255.255#define  GROUP_IP2  "239.255.0.3"//224.0.0.0-239.255.255.255#define  PORT       8058

.cpp文件

#include "struct.h"//int datalen;struct sockaddr_in localSock;struct ip_mreq group1, group2;int GetSOCK_DGRAM(unsigned short port){    SOCKET sd = socket(AF_INET, SOCK_DGRAM, 0);    if(sd < 0){        perror("Opening datagram socket error");        exit(1);    } else        printf("Opening datagram socket....OK.\n");    {       //此处代码用于端口复用        int reuse = 1;        if(setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)) < 0){            perror("Setting SO_REUSEADDR error");            close(sd);            exit(1);        } else            printf("Setting SO_REUSEADDR...OK.\n");     }    int ret = 0;    memset((char *) &localSock, 0, sizeof(localSock));    localSock.sin_family = AF_INET;    localSock.sin_port = port;    localSock.sin_addr.s_addr = INADDR_ANY;    if(bind(sd, (struct sockaddr*)&localSock, sizeof(localSock))){        perror("Binding datagram socket error");        close(sd);        exit(1);    } else    {        printf("Binding datagram socket...OK.\n");    }       group1.imr_multiaddr.s_addr = inet_addr(GROUP_IP1);//相当于组名    group1.imr_interface.s_addr = inet_addr(LOCAL_IP);//自己的ip    if(setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&group1, sizeof(group1)) < 0){        perror("Adding multicast group1 error");        close(sd);        exit(1);    } else        printf("Adding multicast group1...OK.\n");    group2.imr_multiaddr.s_addr = inet_addr(GROUP_IP2);//相当于组名    group2.imr_interface.s_addr = inet_addr(LOCAL_IP);//自己的ip    if(setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&group2, sizeof(group2)) < 0){        perror("Adding multicast group2 error");        close(sd);        exit(1);    } else        printf("Adding multicast group2...OK.\n");    //datalen = recvSize;    return sd;}int InitSocket(){   #ifdef WIN32    int Error;    WORD VersionRequested;    WSADATA WsaData;    VersionRequested=MAKEWORD(2,2);    Error=WSAStartup(VersionRequested,&WsaData); //启动WinSock2    if(Error!=0)    {        return 0;    }    else    {        if(LOBYTE(WsaData.wVersion)!=2||HIBYTE(WsaData.wHighVersion)!=2)        {            WSACleanup();            return 0;        }           }#endif    return 0;}int main(int argc, char *argv[]){    printf("UdeClientStart().group1=%s,group2=%s,port=%d,locol=%s,build=%s\n", GROUP_IP1,GROUP_IP2, PORT, LOCAL_IP, __TIME__);    InitSocket();    SOCKET sd = GetSOCK_DGRAM(htons(PORT));    struct sockaddr_in from;    int fromlen = sizeof(from);     int nRecvLen = 1;    const int FILE_LEN = 1024*10;    //char* bufWrite = new char[FILE_LEN];    const int recvSize = 1024*1000;    unsigned char* databuf = new unsigned char[recvSize];    while(1)//nRecvLen > 0    {        nRecvLen = recvfrom(sd, (char*)databuf, recvSize, 0, (struct sockaddr*)&from, (socklen_t*)&fromlen) ;//read        if (nRecvLen > 0)        {                   //  continue;        }        printf("sendIp = %s,recvBuf=%s\n", inet_ntoa(from.sin_addr), databuf);    }    return 0;}

组播服务端
.cpp文件

#include "../struct.h"int InitSocket(){   #ifdef WIN32    int Error;    WORD VersionRequested;    WSADATA WsaData;    VersionRequested=MAKEWORD(2,2);    Error=WSAStartup(VersionRequested,&WsaData); //启动WinSock2    if(Error!=0)    {        return 0;    }    else    {        if(LOBYTE(WsaData.wVersion)!=2||HIBYTE(WsaData.wHighVersion)!=2)        {            WSACleanup();            return 0;        }           }#endif    return 0;}int main (int argc, char *argv[ ]){    InitSocket();    //设置socket    struct in_addr localInterface;    struct sockaddr_in groupSock;    char bufSend[BUFSIZ];    int sd = socket(AF_INET, SOCK_DGRAM, 0);    if(sd < 0)     {        perror("Opening datagram socket error");        exit(1);    }       memset((char *) &groupSock, 0, sizeof(groupSock));    groupSock.sin_family = AF_INET;    groupSock.sin_addr.s_addr = inet_addr(GROUP_IP1);//GROUP_IP 第一个字节不超过239 后面3个字节用来区别分组 不是掩码    groupSock.sin_port = htons(PORT);    localInterface.s_addr = inet_addr(LOCAL_IP);//自己的ip,可以和目标不在一个网，但设置不同的网段。    //设置组播    if(setsockopt(sd, IPPROTO_IP, IP_MULTICAST_IF, (char *)&localInterface, sizeof(localInterface)) < 0)     {        perror("Setting local interface error");        exit(1);    }    else    {        printf("Setting the local interface...OK\n");    }    for (int i=0;;i++)    {               //Send(bufSend, sizeof(bufSend));                       sprintf(bufSend, "%d", i);        sendto(sd, bufSend, sizeof(bufSend), 0, (struct sockaddr*)&groupSock, sizeof(groupSock));               printf("group=%s,locolip=%s,send=%s\n", GROUP_IP1, LOCAL_IP, bufSend);        Sleep(1000);                             }       return 0;}

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